<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.min.css">
    <style>
        .row>div {
            height: 50px;
            background-color: pink;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="row">
            <div class="col-md-4">左</div>
            <div class="col-md-4 col-md-offset-4">右</div>
        </div>
        <div class="row">
            <div class="col-md-8 col-md-offset-2">中间</div>
        </div>
    </div>
</body>

</html>